Contactame: https://gitter.im/nicatronica/nicatronicavideos
This is the first video on how to work with HttpClient. This video talks specifically about doing an HTTP-GET request.
This video is part of a bigger series on how to develop Angular 2 Dart apps and you can see the whole list of videos here: https://www.youtube.com/playlist?list=PLkMd51xTELZJ_wgutzyYXRbfHDJ12KZ3k